Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

CompTia Network + > -Section 3: OSI Model > Flashcards

-Section 3: OSI Model Flashcards

(47 cards)

Start Studying
1
Q

OSI

A

Open Systems Interconnection (7 Layers)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What are the OSI Model/Stack seven layers

A
  1. Physical (Please)
  2. Data Link (Do)
  3. Network (Not)
  4. Transport (Throw)
  5. Session (Sausage)
  6. Presentation (Pizza)
  7. Application (Away)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

OSI Model Layer 1

A

Physical

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

OSI Model Layer 2

A

Data Link

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

OSI Model Layer 3

A

Network

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

OSI Model Layer 4

A

Transport

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

OSI Model Layer 5

A

Session

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

OSI Model Layer 6

A

Presentation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

OSI Model Layer 7

A

Application

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

MAC Address

A

Media Access Control Address - 48-bit Hexadecimal address assigned to NIC. First 24 bits represent vendor code, second 24 bits are a unique value.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Layer 1 (Physical) Examples

A

Cables (Ethernet, Fiber); RF (WiFi, Bluetooth); Infrastructure (Hub, WAP, Media Converter)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Layer 2 (Data Link) Examples

A

NIC; Bridges; Switches

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

LLC

A

Logical Link Control - sublayer of Data Link (Layer 2) that controls synchronization, multiplexing, flow control and error-checking.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Layer 3 (Network)

A

▪ Forwards Traffic with Logical Address (IP)
▪ Logical addressing
▪ Switching (Not Switches. Switches are Layer 2).
▪ Route Discovery and Selection
▪ Connection Services (Augments Layer 2 for improved reliability) - a.) Flow Control; b.) Packet reordering - supports sending packets over multiple links and routes.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Layer 3 (Network) Examples

A

▪ Routers
▪ Multilayer switches (Functions as Switch and Router)
▪ IPv4 protocol
▪ IPv6 protocol
▪ Internet Control Message Protocol (ICMP)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Layer 4 (Transport)

A

▪ Dividing line between upper and lower layers
▪ Data is sent as segments
▪ TCP/UDP
▪ Windowing
▪ Buffering

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

TCP (Layer 4 Transport)

A

Transmission Control Protocol
▪ Connection-oriented protocol
▪ Reliable transport of segments- If segment dropped,
detects and resends
▪ Acknowledgements received for successful communications.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

UDP (Layer 4 Transport)

A

▪ Connectionless protocol
▪ Unreliable transport of segments
▪ No retransmission
▪ Good for audio/video streaming
▪ Lower overhead for increased performance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Layer 4 (Transport) Examples

Study These Flashcards
A

▪ TCP
▪ UDP
▪ WAN Accelerators
▪ Load Balancers
▪ Firewalls

20
Q

TCP Windowing

Study These Flashcards
A

Adjusts to send more/less data per segment based on retransmissions.

21
Q

Layer 5 (Session)

Study These Flashcards
A

▪ Setting up sessions
▪ Maintaining sessions
▪ Tearing down sessions

22
Q

Layer 5 (Session) Setting Up a Session

Study These Flashcards
A

▪ Check user credentials
▪ Assign numbers to session to identify them
▪ Negotiate services needed for session
▪ Negotiate who begins sending data

23
Q

Layer 5 (Session) Maintaining a Session

Study These Flashcards
A

▪ Transfer the data
▪ Reestablish a disconnected session
▪ Acknowledging receipt of data

24
Q

Layer 5 (Session) Tearing Down a Session

Study These Flashcards
A

▪ Mutual - After the transfer is done
▪ Other party disconnecting

25
Layer 5 (Session) Examples
▪ H.323 - Setup, maintain, and tear down a voice/video ▪ NetBIOS - Share files over a network
26
Layer 6 (Presentation)
▪ Functions (App Services, Service Advertisement) ▪ Data formatting ▪ Encryption
27
Layer 6 (Presentation) Examples
▪ HTML, XML, PHP, JavaScript, … ▪ ASCII, EBCDIC, UNICODE, … ▪ GIF, JPG, TIF, SVG, PNG, … ▪ MPG, MOV, … ▪ TLS, SSL, …
28
Layer 7 (Application)
▪ Provides application-level services (Low level apps like File Transfer, Network Transfer,... Not Word, NotePad,...) ▪ Layer where users communicate with the computer ▪ Application Services and Services Advertisement
29
Packet Switching - Layer 3 (Network)
AKA Routing - Data is divided into packets and forwarded
30
Circuit Switching - Layer 3 (Network)
Dedicated comm. link path
31
Message Switching - Layer 3 (Network)
Similar to Packet Switching except packets can be stored before forwarded.
32
Layer 3 (Network) Route Discovery and Selection
Router Protocols - RIP; OSPF; EIGRP
33
ICMP (Layer 3 - Network)
Internet Control Message Protocol (ICMP) ▪ Used to send error messages and operational information about an IP destination ▪ Not regularly used by end-user applications ▪ Used in troubleshooting (ping and traceroute)
34
Layer 7 (Application) - Application Services
Application services unite communication components from more than one network application. (E.g., File transfers and File Sharing, e-Mail, Remote Access, Network Management, Client/Server processes.)
35
Layer 7 (Application) - Service Advertisement
Some applications send announcements about services they offer, some register with AD instead. (e.g. printer, file server).
36
Layer 7 (Application) -
▪ E-mail (POP3, IMAP, SMTP) ▪ Web Browsing (HTTP, HTTPS) ▪ Domain Name Service (DNS) ▪ File Transfer Protocol (FTP, FTPS) ▪ Remote Access (TELNET, SSH) ▪ Simple Network Management Protocol (SNMP)
37
TCP/IP Model
AKA TCP/IP Stack or DoD Model. Alternative to OSI Model that offers network designers a more relevant model since it is based on TCP/IP and only has 4 layers.
38
TCP/IP Model Layer 1 (Network Interface)
Incorporates features of OSI Layers 1 (Physical) and 2 (Data Link) Physical and Electrical Characteristics; How to transmit bits; How the interface uses the medium.
39
TCP/IP Model Layer 2 (Internet)
Similar to OSI Layer 3 (Network) ▪ Packages data into IP datagrams - Contains source and destination IPs - Forwards datagrams between hosts across the networks ▪ Routes IP datagrams across networks ▪ Connectivity occurs externally
40
TCP/IP Model Layer 2 (Internet) - Examples
▪ IP - Internet Protocol ▪ ICMP - Internet Control Message Protocol (network devices use to communicate problems with data transmission - Number 1 use is reporting errors.) ▪ ARP - Address Resolution Protocol (IP address to MAC address) ▪ RARP - Reverse Address Resolution Protocol (MAC Address to IP address)
41
ICMP
Internet Control Message Protocol - Network devices use to communicate problems with data transmission - Number one use is reporting errors.
42
ARP
Address Resolution Protocol - IP address to MAC address. (Layer 2 - Data Link to Layer 3 - Network Layer)
43
RARP
Reverse Address Resolution Protocol - MAC Address to IP address. (Layer 3 - Network to Layer 2 - Data Link)
44
TCP/IP Model Layer 3 (Transport)
Similar to OSI Layer 4 (Transport) ▪ Provides communication session management between hosts ▪ Defines level of service and status of connection used for transport
45
TCP/IP Model Layer 3 (Transport) - Examples
▪ TCP ▪ UDP ▪ RTP
46
TCP/IP Model Layer 4 (Application)
Combined features of OSI Layers 5 (Session), 6 (Presentation), and 7 (Application) ▪ Defines TCP/IP application protocols ▪ Defines how programs interface with the transport layer service ▪ Layer with which the user interacts
47
TCP/IP Model Layer 4 (Application) - Examples
▪ HTTP, TELNET, FTP, SNMP, DNS, SMTP, SSL, TLS, …

CompTia Network + (13 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions